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sudut yang memiliki besar sama ada 2 sudut.
sudut BAD = 68 derajat
sudut BCD = 82 derajat
sudut ABC = sudut CDA
sudut ABC = 360 - ( 68 + 82 )
= 360 - 150
= 210 : 2 = 105 derajat
maaf klo salah...